libstdc++-v3/testsuite/25_algorithms/equal/no_operator_ne.cc

   1 // 2001-04-06 gdr
   2
   3 // Copyright (C) 2000, 2005 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 #include <vector>
  22 #include <algorithm>
  23
  24 //
  25 // 25.1.8 Make sure std::equal doesn't make any extra assumption
  26 //        about operator== and operator!=
  27 //
  28
  29 struct X { };
  30
  31 bool operator==(X, X) { return true; }
  32
  33 // Not implemented on purpose.  { dg-do link }
  34 bool operator!=(X, X);
  35
  36 int main()
  37 {
  38   std::vector<X> v, w;
  39   return !std::equal(v.begin(), v.end(), w.begin());
  40 }